element {http://www.w3.org/2003/10/issues}pubdate with simple type not allowed element children required attribute xlink{http://www.w3.org/1999/xlink}:href not present required attribute xlink{http://www.w3.org/1999/xlink}:href not present required attribute xlink{http://www.w3.org/1999/xlink}:href not present required attribute xlink{http://www.w3.org/1999/xlink}:href not present